I need a 2x / 8x cash multiplyer for my game but i am struggling to figure out how to do it and how to make sure it only works for a player whom purchases the upgrade.

Connect the questioner to a trigger. Set it to be deactivated when the game starts. Make sure it is not visible in game and you cannot trigger it by stepping on it. Connect the trigger to an item granter that grants 10 cash. Then connect the vending machine to the deactivated trigger to activate it.…